/*      $NetBSD: sx.c,v 1.8 2023/12/20 05:33:18 thorpej Exp $   */

/*-
 * Copyright (c) 2013 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Michael Lorenz.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sx.c,v 1.8 2023/12/20 05:33:18 thorpej Exp $");

#include "locators.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>

#include <uvm/uvm_extern.h>

#include <sys/bus.h>
#include <sparc/dev/sbusvar.h>
#include <machine/autoconf.h>
#include <machine/cpu.h>
#include <machine/ctlreg.h>
#include <sparc/sparc/asm.h>
#include <sparc/dev/sxvar.h>
#include <sparc/dev/sxreg.h>
#include "opt_sx.h"

/* autoconfiguration driver */
static  int sx_match(device_t, struct cfdata *, void *);
static  void sx_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(sx, sizeof(struct sx_softc),
    sx_match, sx_attach, NULL, NULL);

static struct sx_softc *sx0 = NULL;

static int
sx_match(device_t parent, struct cfdata *cf, void *aux)
{
        struct mainbus_attach_args *ma = aux;

        return (strcmp("SUNW,sx", ma->ma_name) == 0);
}

static void
sx_attach(device_t parent, device_t self, void *aux)
{
        struct sx_softc *sc = device_private(self);
        struct mainbus_attach_args *ma = aux;
        uint32_t id;
        int i;
#ifdef SX_DEBUG
        int j;
#endif

        printf("\n");

        sc->sc_dev = self;
        sc->sc_tag = ma->ma_bustag;
        sc->sc_uregs = ma->ma_paddr + 0x1000;
        sc->sc_cnt = 0;

        if (bus_space_map(sc->sc_tag, ma->ma_paddr, 0x1000, 0, &sc->sc_regh)) {
                aprint_error_dev(self, "failed to map registers\n");
                return;
        }

        id = sx_read(sc, SX_ID);
        aprint_normal_dev(self, "architecture rev. %d chip rev. %d\n",
            (id & SX_ARCHITECTURE_MASK),
            (id & SX_CHIP_REVISION) >> 3);

        /* stop the processor */
        sx_write(sc, SX_CONTROL_STATUS, 0);
        /* initialize control registers, clear errors etc. */
        sx_write(sc, SX_R0_INIT, 0);
        sx_write(sc, SX_ERROR, 0);
        /* default, to be overridden once cgfourteen takes over */
        sx_write(sc, SX_PAGE_BOUND_LOWER, 0xfc000000);
        /* cg14 takes up the whole 64MB chunk */
        sx_write(sc, SX_PAGE_BOUND_UPPER, 0xffffffff);
        sx_write(sc, SX_DIAGNOSTICS, SX_DIAG_INIT);
        sx_write(sc, SX_PLANEMASK, 0xffffffff);

        /*
         * initialize all other registers
         * use the direct port since the processor is stopped
         */
        for (i = 4; i < 0x200; i += 4) 
                sx_write(sc, SX_DIRECT_R0 + i, 0);

        /* ... and start the processor again */
        sx_write(sc, SX_CONTROL_STATUS, SX_PB | SX_GO);

        sx0 = sc;

#ifdef SX_DEBUG
        sta(0xfc000000, ASI_SX, SX_LD(8, 31, 0));
        for (i = 1; i < 60; i++)
                sta(0xfc000000 + (i * 1280), ASI_SX, SX_ST(8, 31, 0));
        for (i = 900; i < 1000; i++)
                sta(0xfc000000 + (i * 1280) + 600, ASI_SX, SX_ST(0, 31, 0));

        for (i = 0; i < 0x30; i+= 16) {
                printf("%08x:", i);
                for (j = 0; j < 16; j += 4) {
                        if ((i + j) > 0x28) continue;
                        printf(" %08x",
                            bus_space_read_4(sc->sc_tag, sc->sc_regh, i + j));
                }
                printf("\n");
        }
        printf("registers:\n");
        for (i = 0x300; i < 0x500; i+= 16) {
                printf("%08x:", i);
                for (j = 0; j < 16; j += 4) {
                        printf(" %08x",
                            bus_space_read_4(sc->sc_tag, sc->sc_regh,
                                i + j));
                }
                printf("\n");
        }
#endif
}

void
sx_dump(void)
{
        if (sx0 == NULL)
                return;
        printf("SX STATUS: %08x\n",
            bus_space_read_4(sx0->sc_tag, sx0->sc_regh, SX_CONTROL_STATUS));
        printf("SX ERROR : %08x\n",
            bus_space_read_4(sx0->sc_tag, sx0->sc_regh, SX_ERROR));
        printf("SX DIAG  : %08x\n",
            bus_space_read_4(sx0->sc_tag, sx0->sc_regh, SX_DIAGNOSTICS));
}